Radio receiving apparatus



April 21., 1936. E, A USTAF ON 2,038,281

RADIO RECEIVING APPARATUS Filed March 5, 1934 INVENTOR: Bow/NA.60577050,

ATTORNEY.

Patented Apr. 21, 1936 UNITED STATES PATENT OFFICE Edwin A. Gustafson,Chicago, 111., assignor to Johnson Laboratories, Inc., Chicago, 111., acorporation of Illinois Application March is, 1934, Serial No. 714,019 3Claims. (m n-242) The invention relates to tuning systems forradio-receiving apparatus and particularly to the type which includesinductance tuning, wherein are included relatively adjustable plates,

one of which carries an inductance coil, and the otherv oi. whichcarries a magnetic core, and the invention involves a new arrangement orthe parts of such an apparatus whereby they may be readily dismantled,repaired and reassembled. V

The invention will best be understood it reference be had to theaccompanying drawing in which- Figure 1 is a plan view, partly insection, showing the essential elements of the invention;

Figure 2 is a sectional view taken on the line 22 of Figure 1, the partswithin the casing oi. the apparatus being shown in elevation, and

Figure 3 is a sectional view taken on the line 33 of Figure 1. 7

Referring to the drawing, l is a casing of usual character, in which theoperative parts of the apparatus are assembled.

Within and secured to this casing is a plate 2 on which are mountedhousings 3 for inductance coils 4 and their associated elements, all ofwhich constitute no part of the invention and, therefore, require nodescription. These housings 3 are removably secured to the plate 2 byscrews 5 which enter flanges of the plate.

The coils 4, their mountings 6, and their associated elements, areremovably secured to the housings 3 by screws 1, each of which extendsthrough a flange 8 of a housing and engages a 5 hole in a mounting 6.

The-separability of these parts 01' the device, and the absence of anyproximate elements such as heretoforehave been associated therewith,enable theuser toreodilygainacoesstothemductance coil 4 or any otherelement which re quires attention.

The cores 9 and their housings I! are carried by aplate ll, andall orthese elements consti tute an adjustable unit, the actuating means forthe unit being a screw-threaded shaift II that extends inward throughthe casing l, engages a -W opening of slot for the reception of saidinductance coil and ltsinnerendentersabearingllintheplate '2, the innerend being provided with a collar l5 s and a shoulder it, between whichthe plate is disposed, inorder to prevent the shaft l2 from movinglongitudinally.

The advantages of this invention are due to the fact that a housing anda coil and its associated elements may be assembled and convenientlytested while still accessible and before the housing is united with theother elements of the apparatus, and also that, since the housing whichincludes the coil is detachably mounted on that side of the fixed platewhich is opposite the side that is proximate the adjusting device of theapparatus, the housing may readily be removed without detaching otherelements of the apparatus whenever it becomes necessary to gain accessto and examine or repair the inductance coil or its associated elements.

A further advantage of the invention, due to the simplicity of theapparatus, is that its manui'acture is facilitated and its cost reduced.

ratus, including a fixed plate, a removable houslug disposed at one sideof and carried by said plate, a removable inductance coil carried bysaid housing, a movable plate disposed at the other side of said fixedplate,= a corecarried by said movable plate and aligned with saidinductance coil, and an adjusting mechanism for said movable plate andsaid core.

2. A tuning system for radio-receiving apparatus, including a fixedplate having an opening, a housing disposed at one side of and carriedby said fixed plate, an inductance coil in said housing, a movable corealigned with said inductance coil and the opening of said fixed plate,and having an annular slot for the reception or said inductance coil,and an adjusting mechanism for moving said core until it substantiallysurrounds said inductance coil.

3. A tuning system for radio-receiving apparatus, including a fixedplate, a housing that is open at one end and is substantially closed atthe other end, and also is removably attached at its open end to saidplate, a removable 1nductance coil disposed within and supported by saidhousing, a magnetic core having an annular movable relatively to saidinductance coil, and means for moving said core. i

' A. GUSTAFSONL}

